CN1954514A - Cell search scheduling method - Google Patents
Cell search scheduling method Download PDFInfo
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- CN1954514A CN1954514A CNA2005800156396A CN200580015639A CN1954514A CN 1954514 A CN1954514 A CN 1954514A CN A2005800156396 A CNA2005800156396 A CN A2005800156396A CN 200580015639 A CN200580015639 A CN 200580015639A CN 1954514 A CN1954514 A CN 1954514A
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Abstract
A cell search scheduling method using a mobile communication terminal during a transmission cap sequence in a burst mode comprising a step (step 404) of holding a table (62) of regularly periodical pattern of cell search commands suitable to be executed during the transmission cap sequence and arranged by specified execution times, and steps (steps 408-414) of executing the commands in the table sequentially at specified execution times.
Description
Technical field
The present invention generally relates to the cell search of arranging in the mobile communication subscriber terminal, cell search scheduling during the transmission gap sequence under burst mode (transmission gap sequence).The present invention is applicable to cell search scheduling during the transmission gap sequence under the compact model of mobile W-CDMA system, and describing the present invention in conjunction with this exemplary application will be very easily.But should be appreciated that the present invention is not limited in this application.
Background technology
Mobile telephone system need be used and allow travelling carriage to find and analyze the scheme of the radio signal on the different radio frequency usually from one or more base stations.The process of search different base station is called Cell searching.During cell search process, travelling carriage is discerned all base stations, and determines that in them which is suitable for " being stationed (camping) " most.On the sub-district, be stationed and mean to begin to monitor whether incoming call is arranged or begin to allow the user to spread out of calling.Must periodically carry out call search, because when travelling carriage moves, the signal quality that has been identified as best sub-district may descend, and simultaneously, may improve from the radio signal of another sub-district.Based on the Cell searching that repeats, travelling carriage keeps the tabulation that periodically updates of all available cell.When the signal quality from the sub-district of current use was brought down below certain threshold value, travelling carriage stopped to monitor current area, and had been stationed on new sub-district, and promptly travelling carriage is carried out reselection procedure.
In such as most of mobile systems such as W-CDMA, even when calling is being carried out, also necessary execution cycle property Cell searching, if thereby descend and have better another available sub-district of signal quality simultaneously from the quality of signals of the sub-district of current use, then can carry out handover, and ongoing calling can not lost from a sub-district to next sub-district.
In addition, depending in the mobile system of spread spectrum, sending and receive agreement and be usually designed to and allow travelling carriage to stop to send and receiving temporarily, and on different radio channels, carry out Cell searching such as W-CDMA etc.The instantaneous interruption that sends and receive can not cause any data degradation, because travelling carriage and base station have obtained compensation by interim increase data transmission bauds so that keep total average data transfer rate.In that some move in the W-CDMA system such as UMTS etc., this feature is called as compact model.Compact model is generally controlled by communication network.Before activating transmission time-out or gap sequence, network uses control channel that the definite timing in gap is sent to portable terminal.Then, portable terminal is hoped to use the transmission gap sequence that is provided to carry out Cell searching and measurement on the frequency different with current nominal frequency.This is called as the inter-frequency cell search or measures, or movable between frequency.
For supporting such as for the portable terminal of a plurality of radio access technologies such as two W-CDMA and GSM terminal, network can be provided for carrying out the compressed mode gap sequence of neighboring cell search activity according to the radio access technologies that is different from the radio access technologies that this portable terminal is currently connected to.It is movable that this is called as between system.Network can provide several different compressed mode gap sequences simultaneously, and for example some gap sequences are used for activity between frequency, and some gap sequences are used for activity between system.
In that some move in the W-CDMA system such as UMTS etc., under the situation beyond the activation of compact model, the Cell searching activity can have " burst " characteristic that relates to interim time-out and reactivate.For example, under front access state, terminal can be carried out Cell searching on a radio channel, and is stationed on the sub-district on the different radio radio channel simultaneously.In this case, just sending on the forward access channel under those situations of data burst, must suspend Cell searching in terminal.In other cases, portable terminal can idle (not connecting), but periodically activated a bit of time, so that carry out supervision and the Cell searching bursts of activities of execution on a nominal channel frequency, following another burst on the different radio frequencies after this Cell searching bursts of activities to paging channel.This situation is similar to be carried out in the compact model frequency and activity between frequency.
The method that is provided for carrying out the Cell searching activity during one or more dissimilar burst activity will be useful.Provide the type of not considering related burst activity can be moved that terminal is used for arranging the universal method of Cell searching activity will be useful especially.It also will be useful providing and comparing the general arrangement method that is easier to develop, test and/or realize with the arrangement method that current relating to is used for every type the special method of burst activity and technology.In addition, it will be useful providing the Cell searching activity schedule method that can realize efficiently in portable terminal.
Based on this purpose, one aspect of the present invention provides the method for arranging the Cell searching activity during the transmission gap sequence of burst mode in the mobile communication subscriber terminal, and this method may further comprise the steps:
Maintenance is used for the table of regular periodicity pattern of the suitable Cell searching order of the execution during the transmission gap sequence, wherein said order according to required execution constantly by sequencing; And
In the required execution order in the place order execution list constantly.
The Cell searching order can comprise be used for suspending and recover in the frequency, between frequency or any two or more time-out of intersystem cell search activities and recover to order.Burst mode can comprise the W-CDMA compact model.
Summary of the invention
The present invention can also comprise the step of the table of the regular periodicity pattern that calculates the suitable Cell searching order under one or more predetermined conditions.
Described predetermined condition can comprise when the needs burst mode and need interweave when independently Cell searching is movable.
Described predetermined condition can also comprise that to carry out Cell searching movable and when having carried out last order from table when needs.
Described predetermined condition can also comprise when when carrying out the Cell searching activity when communication network receives the novel type of suitable Cell searching order.
This method can also comprise the step by the table of the regular periodicity pattern of the suitable Cell searching order of following operational computations:
The burst mode pattern that all are movable is decomposed into the regular periodicity pattern of appropriate command;
Be stored in appropriate command and command execution in the table constantly; And
Carry out the order that constantly comes in the sequencing table according to required.
Below description in more detail with reference to each feature of Cell searching activity schedule method of the present invention.For auxiliary the understanding of the present invention, in specification with reference to illustrate accompanying drawing of the present invention with preferred embodiment.But should be appreciated that the present invention is not limited to the preferred embodiment shown in the figure.
Description of drawings
Fig. 1 is the schematic diagram that illustrates a plurality of radio access networks;
Fig. 2 is the schematic diagram of the function element of selecting of travelling carriage that forms the part of a plurality of radio access technologies networks shown in Figure 1;
Fig. 3 shows in frequency, between frequency and the flow chart of the various Cell searching activities of carrying out during the intersystem cell search activities;
Fig. 4 shows during the movable and inter-frequency cell search activities of in frequency Cell searching the sequential chart by the sequence of operation of travelling carriage execution shown in Figure 2;
Fig. 5 shows in frequency, between frequency and the sequential chart of the operation of travelling carriage shown in Figure 2 during the intersystem cell search activities;
Fig. 6 shows the sequential chart of the decomposition of the bursts of activities pattern pattern of carrying out in portable terminal shown in Figure 2;
Fig. 7 shows the flow chart of the step of being carried out by travelling carriage shown in Figure 2 during the Cell searching activity schedule; And
Fig. 8 shows during this step of Cell searching activity schedule shown in Figure 7 schematic diagram to the ordering of the order of safeguarding in temporary table.
Embodiment
With reference now to Fig. 1,, it always shows the wireless communication system 10 that comprises W-CDMA network 12 and base station 14,16 and 18.Wireless communication system 10 also comprises second radio access network (being GSM network 20 in this case) and base station 22,24 and 26.Travelling carriage 28 is suitable for depending on the radio access technologies of travelling carriage 28 current selections, receives from the some radio signals by base station 14,16 and 18 sub-districts of serving and 22 to 26 transmissions from the base station.Though should be appreciated that will be only combining wireless electricity access technology (being W-CDMA and GSM) description incident, the present invention also can be applicable to travelling carriage wherein and is suitable for other a plurality of radio access technologies with a plurality of radio network communications.
Fig. 2 shows the schematic diagram of the element of selecting of travelling carriage 28.Be converted to the demodulator 42 of base band frequency under the radio signal that travelling carriage 28 comprises antenna 40, be used for receiving, and be used for conversion and signal digitalized analog to digital converter 44 demodulation down.Travelling carriage 28 also comprises W-CDMA branch, comprises the sub-district and the down link scrambler of definite this sub-district and the W-CDMA Cell searching device piece 46 of frame synchronization that are used to search for by the service of one of base station 14,16 and 18.W-CDMA demodulator blocka 48 utilizes detected spreading code that the sign indicating number from 46 outputs of W-CDMA Cell searching device piece is carried out demodulation, and 50 pairs of restituted signals from 48 outputs of W-CDMA demodulator blocka of W-CDMA decoder block are decoded.Similarly, travelling carriage 28 comprises the GSM arm, comprises GSM Cell searching device piece 52, GSM demodulator blocka 54 and GSM decoder block 56, and function class is similar to the relevant block in the W-CDMA arm of travelling carriage 28.System controller 58 is controlled the operation of selecting of Cell searching device pieces 46 and 52.The sequence of program instructions that provides first memory equipment 60 to be used for the operation of storage control system controller 58 provides second volatile memory devices 62 to be used for the interim storage of the data that system controller 58 uses when carrying out cell search.
Fig. 1 shows the typical case that travelling carriage 28 carries out the Cell searching activity.In step 70, W-CDMA network 12 transmit a request to travelling carriage 28 so that carry out Cell searching activity in the frequency.The order that maintenance will be carried out during the Cell searching in frequency in the volatile memory 62 of travelling carriage 28 and the timing of these orders.In step 72, travelling carriage 28 is carried out Cell searching activity in this frequency.
But in step 74, W-CDMA network 12 transmit a request to travelling carriage 28, so that carry out the inter-frequency cell search activities.In other words, be not to carry out Cell searching (wherein the sub-district has the peak signal that sends as the travelling carriage 28 current signals that receiving on same frequency) in the frequency, but the sub-district of serving at the base station of a part that forms W-CDMA network 12 on other frequencies is searched for.In step 76, from W-CDMA network 12 compressed mode pattern timing between portable terminal 28 transmission frequency.This pattern of storage regularly in the volatile memory 63 of travelling carriage 28.In step 78, the moment that the data of safeguarding in according to volatile memory 62 are determined, between frequency pattern become movable.In step 80, all be in operation with the inter-frequency cell search activities in the frequency, so these two kinds of Cell searching functions need interweave.In step 82, travelling carriage 28 is reported in the frequencies and the result of inter-frequency cell search activities to W-CDMA network 12.
In step, W-CDMA network 12 can be asked Cell searching activity between travelling carriage 28 executive systems.That is, travelling carriage is not the Cell searching activity of carrying out in the W-CDMA network 12, but can carry out the Cell searching activity in GSM network 20.In step 84, compressed mode pattern regularly also is sent to travelling carriage 28 between system.In step 86, in the frequency, between frequency and the intersystem cell search activities be interleaved.
System controller 58 causes the Cell searching device piece 46 of travelling carriage 28 and 42 the operation of selecting, so that allow, and allow afterwards recovery in the moment of the correct appointment of same Cell searching activity in the interim processing that suspends each Cell searching activity of the moment of correct appointment.The storage of the intermediate object program of Cell searching activity is provided in volatile memory 62, so in the frequency, between frequency and any two or more can being interleaved in the intersystem cell search activities.
Fig. 4 shows the example of the sequence of operation of carrying out in this Cell searching activity that interweaves.Among the figure, system controller 58 sends the interior Cell searching request 101 of frequency to W-CDMA Cell searching device piece 46.This request comprises the correct zero hour of burst in the frequency.Cell searching device piece 46 is in the beginning Cell searching activity zero hours 102.Preferably, realize that in hardware realization utilizes the accurate timing of the Cell searching activity of system clock cycle by the timing of the operation of system controller 58 controls.Follow closely after the interior cell search 103 of Cell searching device piece 46 beginning frequencies, confirm that 104 are sent to system controller 58.Then, whether the definite next Cell searching activity that needs of system controller is that the interior search of frequency at 106 places of the correct moment suspends, and correspondingly send the request 105 that is used for this time-out to Cell searching device piece 46.After Cell searching device piece 46 suspends, confirm 107 from Cell searching device piece 46 retrieval system controllers 58.
After confirmation of receipt 107, system controller 58 determines that subsequently next order that will send is that the inter-frequency cell of recovering to initiate at the correct some place in the moment 109 searches for 110.Therefore, system controller 58 sends corresponding request 108 and arrives W-CDMA cell search block 46 so that initiate inter-frequency cell search activities 110.Follow closely after the block of cells 46 beginning inter-frequency cell search activities, confirm that 111 are returned system controller 58.System controller 58 determines that action requireds are that search suspends between the frequency at correct 113 places constantly, therefore send request 112 to Cell searching device 46 to be used for this time-out.Between Cell searching device time-out frequency, after the search activities 110, confirm that 114 are returned to system controller 58.
Fig. 5 shows and not only carries out Cell searching activity and inter-frequency cell search activities in the frequency but also the example of the travelling carriage 28 of Cell searching activity between executive system.
Travelling carriage 28 is arranged different Cell searching activities, thus inter-frequency measurements in compressed mode pattern 201, carries out, system's measurements is carried out in different compressed mode pattern 202, measurement execution outside any compressed mode pattern 203 in the frequency.Between frequency bursts of activities 205 and frequency between burst 207 and system burst 210 interweave.
Use above-mentioned request/affirmation mechanism (for example using request 204 and the affirmation 206 relevant) to control W-CDMA Cell searching device piece 46 with bursts of activities 205 in the frequency.Bursts of activities 207 occurs in during the repetition transfer sequence gap 208 that provides in the pattern 201 between frequency between frequency, and bursts of activities 210 is arranged between the system of occurring in during the transmission gap sequence 209 in the pattern 202 between frequency.Travelling carriage 28 suspends and recovers order and carry out said process by sending to Cell searching device piece 46, thereby suspends and recover constantly edge corresponding to compressed mode pattern shown in Figure 5.
Travelling carriage 28 is by obtaining time-out or the recovery that order is identified for Cell searching activity in the frequency, inter-frequency cell search activities or intersystem cell search activities from the precalculated temporary table of safeguarding volatile memory 62.System controller 58 sequentially obtains and carries out each order from table.Valuably, use precalculated table to obtain simple and processing fast in this way, need to use processing and energy resource in the travelling carriage minimumly because carry out two or more cell search process that interweave required just from precalculated table look-up command.
In this exemplary embodiment, calculate the table that suspends and recover order as follows.Originally, all movable compressed mode gap patterns all are broken down into suitable time-out and recover the regular periodicity pattern of order.Any other pattern that should be appreciated that compressed mode gap pattern or burst mode activity all can be broken down into suitable time-out and recover the regular periodicity pattern of order.This is possible, because the key element of 3GPP standard has been stipulated the burst mode gap by this way, its intermediate gap is made of the individual dwell set that periodically repeats.
For example, in Fig. 6, compressed mode gap pattern 301 is shown as including the compressed mode transmission gap 303 and 304 that two rules occur between frequency.The standard transmission gap pattern cycle 302 is separated from each other each compressed mode transmission 303, and each compressed mode transmission gap 304 is separated from each other.What generate is called the gap zero hour and gap finish time with the corresponding command sequence in compact model edge.As shown in Figure 6, compressed mode gap pattern 301 can be broken down into regular periodicity gap pattern 305,306,307 and 308 between frequency.Each compressed mode transmission gap 303 and 304 gap begin with gap finish time by the identical standard transmission gap cycle 302 separately.
Can be decomposed into the regular periodicity pattern of order in the same manner similarly such as the burst activity of the measurement of aliging or the other types such as measurement of aliging with the forward access channel measurement occasion with the paging occasion.Which kind of burst measurement is above-mentioned decomposition step depend on just is performed, but the remainder of described scheduling processes is general for all types of burst activity.
In certain embodiments of the present invention, generate extra order so that the various physical restriction of reply portable terminal 28 will be useful.For example, the typical combination of Cell searching equipment and receiver control circuit may need the time to measure in the frequency to switch to inter-frequency measurements and switch in the frequency from inter-frequency measurements to measure.Therefore, be necessary for each compact model edge and generate extra order.As shown in Figure 6, the order that is used for the beginning 309 in gap between frequency may be after the pause command 310 of following same mechanism, and order pattern 311,312,313 and 314 can generate from order pattern 305,306,307 and 308.Therefore, compressed mode pattern 301 is decomposed into 8 order patterns 305 to 314 by system controller 58, and wherein each pattern all is rule and periodic.This decomposition step is designated as 402 in Fig. 7.
Then in step 404, all be stored in the temporary table in the volatile memory 62 from the order of strictly all rules order pattern.For each order, memory command type and system controller 58 should be carried out the orthochronous of this order.In this stage, the storage order of order is unessential, and preferably stores the order from each pattern 305 to 314 continuously, and does not consider the order moment in this stage.For example, refer again to Fig. 6, before proceeding to order pattern 306, order pattern 305 can intactly be stored in the memory.Order can progressively be added to temporary table by all existing patterns, perhaps is filled up to temporary table.In the realization of the present invention of the digital signal processor that relates to the quick execution that realizes the deduplication storage operation, adding the process of commands step to temporary memory table can be optimised valuably.
The exemplary diagram that order in the temporary table in this stage is arranged is shown in and is designated as 501 among Fig. 8.From this figure, can find out the command name that command name (5a, 5b, or the like) is represented corresponding to Fig. 6.Representative embodiment only is illustrative, only shows the compressed mode gap group in two cycles.In fact, the number of times of repetition might be very big, and the benefit of therefore optimizing the method that generates command list is optimised.In the 3GPP standard document, the number of times of repetition is called as " transmission gap repeat count ".
In step 406, all orders in the temporary table all by system controller 58 according to required the executions moment with ascending sort.This step is designated as 502 in Fig. 8.Valuably, the sort algorithm that system controller 58 uses is " Shell sorting " algorithm, does not promptly need the quick general sort algorithm of recurrence.Perhaps, if in addition strict memory constraints on system controller 58 not, then prioritization scheme is recursive algorithm " quicksort ".As the result of this method, the temporary table of order is now according to required execution moment sequencing.Finally being arranged in of ordering in the table is designated as 503 among Fig. 8.Again, command name (5a, 5b etc.) is corresponding with the command name of reference among Fig. 6.Alternatively, show the designated mode that can be examined after the ordering, for example closer to each other and overlapping one or more gaps of having violated the physical restriction of portable terminal 28 to locate errors.
When system controller 58 need to determine the burst mode Cell searching movable, promptly interweave between two or more frequencies when it defines, in the frequency or during newly the needing of system's measurements, system controller 58 calculates the time-out of safeguarding in the volatile memory 62 and recovers command list.When thereby the Cell searching activity had been performed and has been issued this table and need be re-filled from last order of temporary table, this table was also calculated.In addition, when new order pattern offered travelling carriage 28 by network 12 and the Cell searching activity when carrying out, table is also calculated.Regulation to novel type may need system controller 58 to add pattern, deletion pattern or modification current active pattern.
Refer again to Fig. 7, system controller 58 begins Cell searching activity by the order execution from the order that is stored in the table in the volatile memory 62 by determine whether to have arrived the end of table at first in step 408.If like this, then calculate the new table that suspends and recover order in step 410.Being designated as 402 to 406 decomposition storage and ordered steps is carried out subsequently in proper order.
Perhaps, if the end of no show table still, then in step 410, system controller obtains next order for execution from temporary table.In step 412, the hardware in the travelling carriage 28 of this order of needs execution is programmed by system controller 58, thereby this order is performed constantly in required order.In step 414, system controller 58 waits for and has carried out this current order up to hardware that repeating step 408 to 412 then, all are performed up to all orders.
Should be appreciated that at last under the situation that does not break away from the spirit and scope of the present invention, can make various modifications and/or interpolation the Cell searching arrangement method.
Claims (9)
1. method of during the transmission gap sequence of burst mode, in the mobile communication subscriber terminal, arranging the Cell searching activity, this method may further comprise the steps:
Maintenance is used for the table of regular periodicity pattern of the suitable Cell searching order of the execution during the described transmission gap sequence, and wherein said order is according to required execution sequencing constantly; And
Described required execution constantly order carry out order in the described table.
2. the method for claim 1, wherein said Cell searching order comprise be used for suspending and recover in the frequency, between frequency or the intersystem cell search activities any two or more time-out and recover order.
3. method as claimed in claim 2, wherein said burst mode comprises the W-CDMA compact model.
4. as the described method of the arbitrary claim in front, also be included under one or more predetermined conditions, calculate the step of table of the regular periodicity pattern of suitable Cell searching order.
5. method as claimed in claim 4, wherein said predetermined condition comprise when the needs burst mode and need interweave when independently Cell searching is movable.
6. as any described method in claim 4 or 5, wherein said predetermined condition comprises that to carry out Cell searching movable and when having carried out last order from table when needs.
7. as any one described method in the claim 4 to 6, wherein said predetermined condition comprises when in current execution Cell searching activity the time when communication network receives the novel type of suitable Cell searching order.
8. as the described method of the arbitrary claim in front, also comprise the step of the table of the regular periodicity pattern by the suitable Cell searching order of following operational computations:
The burst mode pattern that all are movable is decomposed into the regular periodicity pattern of appropriate command;
Appropriate command and command execution are stored in the described table constantly; And
According to the required described order of carrying out in the described table that constantly sorts.
9. mobile communication subscriber terminal comprises:
Data storage device is used to safeguard that the table of regular periodicity pattern of the suitable Cell searching order of the execution during the transmission gap sequence that is used for burst mode, wherein said order are according to required execution sequencing constantly; And
Control appliance is used for arranging the Cell searching activity according to the arbitrary claim in front.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004902745 | 2004-05-21 | ||
| AU2004902745A AU2004902745A0 (en) | 2004-05-21 | Method of scheduling cell search operations | |
| AU2005201793 | 2005-04-28 |
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| CN1954514A true CN1954514A (en) | 2007-04-25 |
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| CNA2005800156396A Pending CN1954514A (en) | 2004-05-21 | 2005-05-23 | Cell search scheduling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9036599B2 (en) | 2008-05-11 | 2015-05-19 | Qualcomm Incorporated | Systems and methods for multimode wireless communication handoff |
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- 2005-05-23 CN CNA2005800156396A patent/CN1954514A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9036599B2 (en) | 2008-05-11 | 2015-05-19 | Qualcomm Incorporated | Systems and methods for multimode wireless communication handoff |
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